US5534155A - Method for purification of cooling agents and/or lubricants used in rolling mills - Google Patents

Method for purification of cooling agents and/or lubricants used in rolling mills Download PDF

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Publication number
US5534155A
US5534155A US07/883,827 US88382792A US5534155A US 5534155 A US5534155 A US 5534155A US 88382792 A US88382792 A US 88382792A US 5534155 A US5534155 A US 5534155A
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US
United States
Prior art keywords
rolling
water
rolling scale
oil
process water
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Expired - Fee Related
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US07/883,827
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English (en)
Inventor
Werner Schimion
Willi Leineweber
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SMS Siemag AG
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SMS Schloemann Siemag AG
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Assigned to SMS SCHLOEMANN-SIEMAG AKTIENGESELLSCHAFT reassignment SMS SCHLOEMANN-SIEMAG AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LEINEWEBER, WILLI, SCHIMION, WERNER
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/04—Working-up used lubricants to recover useful products ; Cleaning aqueous emulsion based
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0009—Settling tanks making use of electricity or magnetism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0084—Enhancing liquid-particle separation using the flotation principle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/962—Treating or using mill scale

Definitions

  • the invention deals with a method for purifying cooling liquids used for cooling and/or for lubricating, that are interspersed or loaded with metallic and/or other material impurities, especially for separation of rolling scale and oily or greasy substances from industrial process or efflux water in open cooling circulation cycles or systems in the iron or steel industry, especially in rolling mills.
  • This invention deals also with a pertinent purification installation or plant for performing the method.
  • cooling and lubricating agents are therefore continuously contaminated with a fine dust or grit from the shaping process.
  • lubricants aging products are additionally formed. Since these cooling and lubricating agents consequently are continuously enriched by fines or grit and other contaminations, they must be purified. The process behavior and the useful life of these media are considerably improved not only by a thorough and continuous purification of the cooling agents or lubricants, but the overall results of the machining and the chipless forming technology are optimized.
  • An installation for purification of liquids or liquors in rolling mills containing contaminants, residues and/or aging products is known from the DE-OS 36 16 426.
  • the contaminated liquids used for cooling and/or lubrication in rolling mills are, to begin with, collected in a collection tank and are plumped from there towards several diaphragm filters which are located in a reverse flushing cycle and are cyclically activated.
  • the filter outputs of the diaphragm filters lead to a presetting tank, from which the purified liquid can be drawn off by means of an initial pump and be directed to its intended use, for instance to a rolling mill to be cooled.
  • a separate precipitation vessel is provided for purifying the highly contaminated liquid passing through the diaphragm filters during the flushing process.
  • Overflow troughs or ducts are provided in the upper region of the precipitation vessel, into which the liquid precleaned by the precipitation can overflow.
  • the liquid collected in the overflow troughs is at least partially pumped back by a pump in a regulated manner to the diaphragm filters and serves there, as a reverse flushing means for cleaning or purifying the diaphragms arranged in the filters.
  • one aspect of the present invention resides in a method for purifying industrial process water in open cooling circulation cycles, having the following features: the coarse rolling scale is separated from the contaminated process water by means of gravity sedimentation; and the rolling scale particles of average or finer size are removed from the process water prepurified in the above manner preferably by magnetic separation.
  • the thus finely clarified process water or effluent is subjected to flotation and separated into fractions containing oil concentrates, water and very fine rolling scale particles containing little oil.
  • the individual fractions, such as the clarified process water are reused as cooling agents and the entire rolling scale separated from the process water is smelted as iron sinter.
  • the oil-rich concentrates are either discarded or subjected to a waste oil purification.
  • the inventive method is performed in a purification installation according to the invention by a precipitation tank for the supply of used and contaminated process water as well as a device for removal of sedimented coarse rolling scale, and a device for the transfer of the preclarified process water into a presetting tank with an additional solid material separator installed therein, this is preferably a magnetic separator for average and fine rolling scale particles, as well as a device for transfer of the finish-clarified process water into a flotation apparatus with forced or positive aeration or cooling, whose fraction outlets are provided with conveyance means for return of the fractionalized products such as process water into the cooling cycle of the rolling mill and for transfer of the separated rolling scale into a smelting or metallurgical plant as well as for transfer of the filtrate containing oil into a waste oil purification apparatus.
  • a precipitation tank for the supply of used and contaminated process water as well as a device for removal of sedimented coarse rolling scale
  • the essential advantage of the invention lies consequently in that the formation of the rolling scale sludges containing oil and hitherto separated out of the water circulation cycles in rolling mills are completely eliminated. It is well known that these rolling scale sludges, containing from 20 to 30% of oil shares which accumulate in conventional cleaning procedures and which hitherto were dumped, present a considerable load on the environment.
  • the clear water obtained from the flotation process is filtered and subsequently sprayed in a cooling tower and collected and returned to the point of use in the rolling mill.
  • the fraction outlet of this flotation apparatus for clear process water is in this case possibly connected with the filter, whose filter output is connected to a cooling tower and with a pump collection or header tank arranged thereunder, whose pump is in connection with a cooling water user in the rolling mill through connection lines.
  • the repeated filtering of the clear water from the flotation apparatus is indicated if any sort of operational malfunction with solid material penetrations should occur in the flotation cells.
  • the rolled scale particles containing little oil separated in the flotation process are ground up and suspended in water.
  • the suspension is then separated into fractions in a secondary flotation, containing oil concentrate, water and very fine rolling scale particles.
  • Mechanical processing of the scale particles occurs, among other things, in the mill whereby the adhering oil particles are entirely detached or can be more easily separated in a suspension tank located downstream. Detergents such as tenside, surfactant, or the like can be expediently added at that point.
  • the thus prepared suspension can be separated in a particularly simple manner by means of subsequent flotation into the three named fractions.
  • the concentrate-containing oil emanating from the initial flotation of the process water and the concentrate-containing oil emanating from the finer flotation of the suspension are separated into several material phases especially into the fractions with oil, water and small shares of rolling scales. From a plant technology point of view this is achieved by connecting the fraction outlet of the concentrate containing oil of the first flotation apparatus and/or the second flotation apparatus with a centrifuge, especially with a three-phase separator with outlet apertures for purified water, waste oil as well as solid materials. In this way flowable waste oil in separated from the water purification process, which can be filled into oil barrels and can easily be temporarily stored, before it is transported into a waste oil dressing or purification plant, or can again be used in the rolling mill.
  • FIGURE schematically illustrates the present invention.
  • the largest quantities of scale accumulate especially in rolling mills with continuous casting installation, where simultaneously large quantities of exposed or open cooling water are used.
  • the rolling scale is formed by oxygen in the air combining with iron.
  • the scale is composed of the different forms of iron oxide FeO, Fe 2 O 3 and Fe 3 O 4 .
  • the iron content amounts to 70 to 75%.
  • oxyacetylene cutting and scale oxidation must be added to the scale losses.
  • the scale is obtained over a distance from the ingot mold up to the loading arrangements.
  • large blooming mill trains in hot rolling mills the scale is obtained in the form of large flat cakes and so-called fish.
  • the highly contaminated process water W 1 flowing in the scale channels is, to begin with, supplied according to the invention to a sedimentation tank 1 arranged externally of the rolling mill proper.
  • a coarse purification occurs in the sedimentation tank 1 by large scale flat cakes and scale fish as well as large particles of the flame cutting and scale oxidation accumulating on the bottom of the sedimentation tank.
  • the coarse rolling scale Z 1 with an average diameter larger than 0.5 mm is separated to the extent of 80% from the process water by the action of gravity.
  • the separated coarse rolling scale is decidedly low in oil content. It is from time to time lifted out of the sedimentation tank 1 by a crane installation 18 shown diagrammatically, and is supplied by a conveyor belt 19 to a smelting or metallurgical plant 21.
  • the process water which has been coarse clarified in the sedimentation tank 1, flows subsequently through a magnetic separator 3 installed in a downstream pump collection or header tank.
  • a magnetic separator 3 installed in a downstream pump collection or header tank.
  • the average and fine rolling scale particles Z 2 between 0 and 0.5 mm diameter are separated by means of the magnetic separator 3 from the process water with a separation efficiency of 50 to 80% and are scraped or wiped off the magnetic separator above the water level.
  • the mid-size and fine rolling scale particles can still be classified as containing little oil and can therefore together with the coarse rolling scale from the sedimentation tank 1 be supplied by means of the conveyor belt 19 to the smelting plant 21 after being drained in a drainage tank 20.
  • the process water contaminated with oil and grease and still interspersed with specific shares of fine rolling scale particles as well as with very fine rolling scale particles is subsequently conveyed out of the collection or header tank 2 by pumps 4 through a line 5 to a flotation apparatus 6 located above the level of the smelter.
  • the finish clarified process water in the flotation apparatus 6 is separated into fractions of oil concentrates, water, and scale particles with very little oil.
  • the process water and materials it contains flow with positive guidance through the flotation apparatus 6, wherein air is added in as fine a dispersion as possible.
  • a bubbly foam is obtained which is continuously drawn off and removed from the upper region of the flotation cell through an adjustable annular space.
  • Various reagents can be added for assisting the flotation process, if necessary.
  • the thus obtained oil concentrate flows through a line 6.3 into a separator 7.
  • the process water clarified in the flotation apparatus 6 is directed through the line 6.1 having a gradient through a gravity filter 8 utilized as a final filter, which is to fulfill its filtering tasks only if the degree of separation cannot be precisely achieved in the flotation apparatus 6, and solid materials pass into the process water which as such has been purified or clarified.
  • the clarified process water is directed to a cooling tower installation 9 where the water is sprayed, cooled and collected in the pump collection or header tank 10 located below the cooling tower. During this cooling process the water sprayed throughout the cooling tower is cooled down to the required operational temperature.
  • the clarified industrial process water W 2 is again conveyed back from the pump collection tank 10 by the pump 11 and the line 17 to the users in the rolling mill.
  • the fine to finest rolling scale with the particle size of between 0.001 mm to 0.5 mm separated to the extent of 90 to 95% in the flotation apparatus from the process water is collected in the underflow 6.2 of the flotation apparatus 6 and from there is supplied to a mill 12.
  • the rolling scale containing oil is ground up in the mill and is herein exposed to shear forces among others.
  • the product obtained thereby arrives into a suspension tank 13 enriched with water, where the oil phase can again separate from the rolling scale particles.
  • the suspension is introduced by means of a positive action pump 14 and a pipeline 15 into a second flotation apparatus 16 for final flotation. In the flotation apparatus 16 the suspension is separated into three fractions by means of a process described in connection with the flotation apparatus 6.
  • the oil concentrate accumulating therein is supplied to the separator 7 through a pipeline 16.3 and is divided in the separator, as has been described previously, into waste oil, water and smallest shares of the most fine rolling scale.
  • the water clarified in the flotation apparatus 16 is sent by gravity through a pipeline 16.1 to the pump collection tank 2. This quantity of water, which can correspond to the quantity of water lost, is thus returned into the water purification circulation cycle.
  • the finest oil-poor rolling scale Z 3 in the; underflow 16.2 of the flotation apparatus 16 is drawn off from there and arrives together with the remaining rolling scale Z 1 from the sedimentation tank 1 and the rolling scale Z 2 from the pump collection tank 2 onto the sinter belt 19 and from there, after it has been drained in the drainage tank 20, into the smelting or metallurgical installation 21.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Physical Water Treatments (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
US07/883,827 1991-05-15 1992-05-15 Method for purification of cooling agents and/or lubricants used in rolling mills Expired - Fee Related US5534155A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4115819A DE4115819A1 (de) 1991-05-15 1991-05-15 Verfahren zur aufbereitung von in walzwerksanlagen benutzten kuehl- und/oder schmiermitteln und hierzu eine aufbereitungsanlage
DE4115819.9 1991-05-15

Publications (1)

Publication Number Publication Date
US5534155A true US5534155A (en) 1996-07-09

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US07/883,827 Expired - Fee Related US5534155A (en) 1991-05-15 1992-05-15 Method for purification of cooling agents and/or lubricants used in rolling mills

Country Status (5)

Country Link
US (1) US5534155A (de)
EP (1) EP0513809B1 (de)
JP (1) JP3159777B2 (de)
AT (1) ATE159278T1 (de)
DE (2) DE4115819A1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5766450A (en) * 1996-09-25 1998-06-16 Bethlehem Steel Corporation Apparatus for magnetically filtering wastewaters containing oil-coated mill scale
KR19980032674A (ko) * 1996-10-09 1998-07-25 플레밍귄터 철강산업에 이용하는 냉매 및/또는 윤활제의 정화 및 선별장치 및 그 방법
US6274037B1 (en) * 1998-04-01 2001-08-14 Yamaha Hatsudoki Kabushiki Kaisha Coolant purification system
US20040049265A1 (en) * 1995-04-19 2004-03-11 Schneider (Usa) Inc. Drug coating with topcoat
US6705142B1 (en) * 1999-08-07 2004-03-16 Henkel Kommanditgesellschaft Auf Aktien Metal shaping process using a novel two phase cooling lubricant system
US20060088654A1 (en) * 1995-04-19 2006-04-27 Boston Scientific Scimed, Inc. Drug release coated stent
US20120298224A1 (en) * 2010-01-29 2012-11-29 Toshiba Mitsubishi-Electric Industrial Systems Corporation Water injection controller, water injection control method, and water injection control program for rolling lines
RU175470U1 (ru) * 2016-11-30 2017-12-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Устройство очистки СОЖ
CN113399115A (zh) * 2021-07-29 2021-09-17 张鸿文 一种矿产生产用铁质矿石分离提纯设备
IT202100008330A1 (it) * 2021-04-01 2022-10-01 Danieli Off Mecc Impianto e procedimento per la rimozione di solidi sospesi, oli e grassi da acque di raffreddamento nel settore siderurgico e metallurgico
CN115215500A (zh) * 2022-08-18 2022-10-21 合肥丰蓝电器有限公司 一种液冷机组用的冷却液过滤装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028737A1 (de) * 2007-06-21 2008-12-24 Ulrich Georg Hammer Verfahren und Vorrichtung zur Aufbereitung von Walzöl
EP2113490B1 (de) * 2008-04-28 2012-09-12 Edgar Bonnaire Verfahren und Vorrichtung zur mechanischen Auftrennung von Sekundärrohrstoffen aus eisenhaltigen Schlämmen
DE102011016190A1 (de) * 2011-04-06 2012-10-11 OKO-tech GmbH & CO. KG Verfahren und Vorrichtung zum Entmischen und Trennen eines Stoffgemisches
DE102019200760A1 (de) * 2019-01-22 2020-07-23 Sms Group Gmbh Vorrichtung und Verfahren zum Entzundern eines bewegten Werkstücks
AT522690B1 (de) * 2019-11-26 2021-01-15 Lubot Schmierstoff Und Prozesstechnik Gmbh Aufbereitungseinrichtung und Verfahren zum Aufbereiten von mit Feststoffen beladener Prozessflüssigkeit
DE102020213077A1 (de) * 2020-10-16 2022-04-21 Sms Group Gmbh Verfahren zur Aufbereitung eines mit organischen Stoffen und anorganischen Partikeln belasteten Kühlkreislaufwassers

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US388774A (en) * 1888-08-28 Egbert b
US3574329A (en) * 1969-09-29 1971-04-13 David K Beavon Process for purifying water containing oil and solids
US4120697A (en) * 1977-04-15 1978-10-17 Amax Inc. Segregation-separation of copper from nickel in copper-nickel sulfide concentrates
US4234420A (en) * 1979-05-03 1980-11-18 Turbeville Joseph E Method and apparatus for pollutant spill control
US4272341A (en) * 1980-01-09 1981-06-09 Duval Corporation Process for recovery of metal values from lead-zinc ores, even those having a high carbonate content
US4995912A (en) * 1990-01-29 1991-02-26 Nalco Chemical Company Mill scale de-oiling
US5047083A (en) * 1989-06-15 1991-09-10 Nalco Chemical Company Process for de-oiling mill scale
US5147554A (en) * 1990-06-26 1992-09-15 Filterwerk Mann & Hummel Gmbh Process for treating wastes from the machining of ferromagnetic materials

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GB615705A (en) * 1943-05-28 1949-01-11 American Cyanamid Co Method and apparatus for clarifying lubricating and cooling liquids
DE2220132C3 (de) * 1972-04-25 1975-10-09 Man Waerme- Und Lufttechnik Gmbh, 3300 Braunschweig Verfahren und Vorrichtung zum Abtrennen von Sinter aus einer Flüssigkeit
DE2743055A1 (de) * 1977-09-24 1979-03-29 Schloemann Siemag Ag Einrichtung zur reinigung von schmier- und/oder kuehlemulsionen
DE3146809C1 (de) * 1980-11-15 1982-11-04 Schauenburg Maschinen- und Anlagen-Bau GmbH, 4330 Mülheim Verfahren und Anlage zur Reduzierung des Ölgehaltes von ölverschmutztem Walzsinter
DE3223011A1 (de) * 1981-12-01 1983-07-14 Thyssen Industrie Ag, 4300 Essen Verfahren und anlage zur reinigung von mit fettigen substanzen, insbesondere oel, verschmutztem walzzunder und zur gewinnung von erdoel aus oelhaltigen mineralien
SU1456464A1 (ru) * 1986-11-04 1989-02-07 Всесоюзный Научно-Исследовательский И Проектный Институт По Очистке Технологических Газов, Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии "Внипичерметэнергоочистка" Способ регенерации водоэмульсионной смазочно-охлаждающей жидкости

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388774A (en) * 1888-08-28 Egbert b
US3574329A (en) * 1969-09-29 1971-04-13 David K Beavon Process for purifying water containing oil and solids
US4120697A (en) * 1977-04-15 1978-10-17 Amax Inc. Segregation-separation of copper from nickel in copper-nickel sulfide concentrates
US4234420A (en) * 1979-05-03 1980-11-18 Turbeville Joseph E Method and apparatus for pollutant spill control
US4272341A (en) * 1980-01-09 1981-06-09 Duval Corporation Process for recovery of metal values from lead-zinc ores, even those having a high carbonate content
US5047083A (en) * 1989-06-15 1991-09-10 Nalco Chemical Company Process for de-oiling mill scale
US4995912A (en) * 1990-01-29 1991-02-26 Nalco Chemical Company Mill scale de-oiling
US5147554A (en) * 1990-06-26 1992-09-15 Filterwerk Mann & Hummel Gmbh Process for treating wastes from the machining of ferromagnetic materials

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040049265A1 (en) * 1995-04-19 2004-03-11 Schneider (Usa) Inc. Drug coating with topcoat
US20060088654A1 (en) * 1995-04-19 2006-04-27 Boston Scientific Scimed, Inc. Drug release coated stent
US5766450A (en) * 1996-09-25 1998-06-16 Bethlehem Steel Corporation Apparatus for magnetically filtering wastewaters containing oil-coated mill scale
KR19980032674A (ko) * 1996-10-09 1998-07-25 플레밍귄터 철강산업에 이용하는 냉매 및/또는 윤활제의 정화 및 선별장치 및 그 방법
US5938935A (en) * 1996-10-09 1999-08-17 Sms Schloemann-Siemag Aktiengesellschaft Method and apparatus for purifying and treating cooling agents and or lubricants used in the metallurgical industry
CN1127453C (zh) * 1996-10-09 2003-11-12 Sms舒路曼-斯玛公司 用于对冷却剂和／或润滑剂进行净化和处理的方法和设备
US6274037B1 (en) * 1998-04-01 2001-08-14 Yamaha Hatsudoki Kabushiki Kaisha Coolant purification system
US6705142B1 (en) * 1999-08-07 2004-03-16 Henkel Kommanditgesellschaft Auf Aktien Metal shaping process using a novel two phase cooling lubricant system
US20120298224A1 (en) * 2010-01-29 2012-11-29 Toshiba Mitsubishi-Electric Industrial Systems Corporation Water injection controller, water injection control method, and water injection control program for rolling lines
US9180505B2 (en) * 2010-01-29 2015-11-10 Toshiba Mitsubishi-Electric Industral Systems Corporation Water injection controller, water injection control method, and water injection control program for rolling lines
RU175470U1 (ru) * 2016-11-30 2017-12-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Устройство очистки СОЖ
IT202100008330A1 (it) * 2021-04-01 2022-10-01 Danieli Off Mecc Impianto e procedimento per la rimozione di solidi sospesi, oli e grassi da acque di raffreddamento nel settore siderurgico e metallurgico
WO2022208419A1 (en) * 2021-04-01 2022-10-06 Danieli & C. Officine Meccaniche S.P.A. Plant and process for removing suspended solids, oils and greases from cooling water in the steel and metallurgical sector
CN113399115A (zh) * 2021-07-29 2021-09-17 张鸿文 一种矿产生产用铁质矿石分离提纯设备
CN115215500A (zh) * 2022-08-18 2022-10-21 合肥丰蓝电器有限公司 一种液冷机组用的冷却液过滤装置
CN115215500B (zh) * 2022-08-18 2023-12-08 合肥丰蓝电器有限公司 一种液冷机组用的冷却液过滤装置

Also Published As

Publication number Publication date
JPH05132678A (ja) 1993-05-28
EP0513809B1 (de) 1997-10-15
ATE159278T1 (de) 1997-11-15
JP3159777B2 (ja) 2001-04-23
EP0513809A3 (en) 1993-03-17
DE59208964D1 (de) 1997-11-20
DE4115819A1 (de) 1992-11-19
EP0513809A2 (de) 1992-11-19

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